//
// Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
// Copyright (C) 2013 LunarG, Inc.
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//
// For recording and playing back the stream of tokens in a macro definition.
//

#if (defined(_MSC_VER) && _MSC_VER < 1900 /*vs2015*/)
#define _CRT_SECURE_NO_WARNINGS
#define snprintf sprintf_s
#endif

#include <cassert>
#include <cstdlib>
#include <cstring>
#include <cctype>

#include "PpContext.h"
#include "PpTokens.h"

namespace glslang {

void TPpContext::lAddByte(TokenStream& fTok, unsigned char fVal)
{
    fTok.data.push_back(fVal);
}

/*
* Get the next byte from a stream.
*/
int TPpContext::lReadByte(TokenStream& pTok)
{
    if (pTok.current < pTok.data.size())
        return pTok.data[pTok.current++];
    else
        return EndOfInput;
}

void TPpContext::lUnreadByte(TokenStream& pTok)
{
    if (pTok.current > 0)
        --pTok.current;
}

/*
* Add a token to the end of a list for later playback.
*/
void TPpContext::RecordToken(TokenStream& pTok, int token, TPpToken* ppToken)
{
    const char* s;
    char* str = NULL;

    if (token > PpAtomMaxSingle)
        lAddByte(pTok, (unsigned char)((token & 0x7f) + 0x80));
    else
        lAddByte(pTok, (unsigned char)(token & 0x7f));

    switch (token) {
    case PpAtomIdentifier:
    case PpAtomConstString:
        s = ppToken->name;
        while (*s)
            lAddByte(pTok, (unsigned char) *s++);
        lAddByte(pTok, 0);
        break;
    case PpAtomConstInt:
    case PpAtomConstUint:
    case PpAtomConstInt64:
    case PpAtomConstUint64:
    case PpAtomConstFloat:
    case PpAtomConstDouble:
#ifdef AMD_EXTENSIONS
    case PpAtomConstFloat16:
#endif
        str = ppToken->name;
        while (*str) {
            lAddByte(pTok, (unsigned char) *str);
            str++;
        }
        lAddByte(pTok, 0);
        break;
    default:
        break;
    }
}

/*
* Reset a token stream in preparation for reading.
*/
void TPpContext::RewindTokenStream(TokenStream& pTok)
{
    pTok.current = 0;
}

/*
* Read the next token from a token stream (not the source stream, but stream used to hold a tokenized macro).
*/
int TPpContext::ReadToken(TokenStream& pTok, TPpToken *ppToken)
{
    int ltoken, len;
    int ch;

    ltoken = lReadByte(pTok);
    ppToken->loc = parseContext.getCurrentLoc();
    if (ltoken > 127)
        ltoken += 128;
    switch (ltoken) {
    case '#':
        // Check for ##, unless the current # is the last character
        if (pTok.current < pTok.data.size()) {
            if (lReadByte(pTok) == '#') {
                parseContext.requireProfile(ppToken->loc, ~EEsProfile, "token pasting (##)");
                parseContext.profileRequires(ppToken->loc, ~EEsProfile, 130, 0, "token pasting (##)");
                ltoken = PpAtomPaste;
            } else
                lUnreadByte(pTok);
        }
        break;
    case PpAtomConstString:
    case PpAtomIdentifier:
    case PpAtomConstFloat:
    case PpAtomConstDouble:
#ifdef AMD_EXTENSIONS
    case PpAtomConstFloat16:
#endif
    case PpAtomConstInt:
    case PpAtomConstUint:
    case PpAtomConstInt64:
    case PpAtomConstUint64:
        len = 0;
        ch = lReadByte(pTok);
        while (ch != 0 && ch != EndOfInput) {
            if (len < MaxTokenLength) {
                ppToken->name[len] = (char)ch;
                len++;
                ch = lReadByte(pTok);
            } else {
                parseContext.error(ppToken->loc, "token too long", "", "");
                break;
            }
        }
        ppToken->name[len] = 0;

        switch (ltoken) {
        case PpAtomIdentifier:
            break;
        case PpAtomConstString:
            break;
        case PpAtomConstFloat:
        case PpAtomConstDouble:
#ifdef AMD_EXTENSIONS
        case PpAtomConstFloat16:
#endif
            ppToken->dval = atof(ppToken->name);
            break;
        case PpAtomConstInt:
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->ival = (int)strtol(ppToken->name, 0, 16);
                else
                    ppToken->ival = (int)strtol(ppToken->name, 0, 8);
            } else
                ppToken->ival = atoi(ppToken->name);
            break;
        case PpAtomConstUint:
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->ival = (int)strtoul(ppToken->name, 0, 16);
                else
                    ppToken->ival = (int)strtoul(ppToken->name, 0, 8);
            } else
                ppToken->ival = (int)strtoul(ppToken->name, 0, 10);
            break;
        case PpAtomConstInt64:
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->i64val = strtoll(ppToken->name, nullptr, 16);
                else
                    ppToken->i64val = strtoll(ppToken->name, nullptr, 8);
            } else
                ppToken->i64val = atoll(ppToken->name);
            break;
        case PpAtomConstUint64:
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->i64val = (long long)strtoull(ppToken->name, nullptr, 16);
                else
                    ppToken->i64val = (long long)strtoull(ppToken->name, nullptr, 8);
            } else
                ppToken->i64val = (long long)strtoull(ppToken->name, 0, 10);
            break;
        }
    }

    return ltoken;
}

int TPpContext::tTokenInput::scan(TPpToken* ppToken)
{
    return pp->ReadToken(*tokens, ppToken);
}

// We are pasting if the entire macro is preceding a pasting operator
// (lastTokenPastes) and we are also on the last token.
bool TPpContext::tTokenInput::peekPasting()
{
    if (! lastTokenPastes)
        return false;
    // Getting here means the last token will be pasted.

    // Are we at the last non-whitespace token?
    size_t savePos = tokens->current;
    bool moreTokens = false;
    do {
        int byte = pp->lReadByte(*tokens);
        if (byte == EndOfInput)
            break;
        if (byte != ' ') {
            moreTokens = true;
            break;
        }
    } while (true);
    tokens->current = savePos;

    return !moreTokens;
}

void TPpContext::pushTokenStreamInput(TokenStream& ts, bool prepasting)
{
    pushInput(new tTokenInput(this, &ts, prepasting));
    RewindTokenStream(ts);
}

int TPpContext::tUngotTokenInput::scan(TPpToken* ppToken)
{
    if (done)
        return EndOfInput;

    int ret = token;
    *ppToken = lval;
    done = true;

    return ret;
}

void TPpContext::UngetToken(int token, TPpToken* ppToken)
{
    pushInput(new tUngotTokenInput(this, token, ppToken));
}

} // end namespace glslang
